【单选题】---How did it _________ that all the flowers died ? ---I had forgotten to water them.
【单选题】—You didn’t come to school yesterday, did you? —_______, though I was very busy.
【单选题】真实气体在什么状态下其行为会接近理想气体:
【简答题】世界工业机器人四大家族是指________、________、___________、____________。
【多选题】下列各项中 , 能够揭示成本性态分析与成本按其性态分类关系的有 ()
【简答题】世界工业机器人四大家族是指()、()、()、()。